WFQ is applied by default to all lines at E1 speeds (2 megabits per second) and below, provided that they are not using LAPB or PPP compression. When WFQ is enabled, low-volume flows such as Telnet or text-only Web traffic, which usually constitute the majority, are given higher priority on the link. High-volume flows such as FTP or multimedia Web content, which are generally fewer, share the remaining bandwidth on an FIFO basis and absorb the latency penalty. Figure 14-5 summarizes the operation of WFQ within the router.
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